From: Jim Wilson <wilson@gcc.gnu.org>
Date: Sun, 3 Jul 1994 01:14:43 +0000 (-0700)
Subject: (loop_iterations): Only use REG_EQUAL note value if it
X-Git-Tag: misc/cutover-egcs-0~6295
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f0c94be0eb12ba81c9c2c893ba6d85a8bd28267f;p=thirdparty%2Fgcc.git

(loop_iterations): Only use REG_EQUAL note value if it
is constant.

From-SVN: r7648
---

diff --git a/gcc/unroll.c b/gcc/unroll.c
index 3f628bddc8a7..9b968ac9696c 100644
--- a/gcc/unroll.c
+++ b/gcc/unroll.c
@@ -3160,7 +3160,11 @@ loop_iterations (loop_start, loop_end)
 		{
 		  rtx note = find_reg_note (insn, REG_EQUAL, NULL_RTX);
 
-		  if (note && GET_CODE (XEXP (note, 0)) != EXPR_LIST)
+		  /* Only use the REG_EQUAL note if it is a constant.
+		     Other things, divide in particular, will cause
+		     problems later if we use them.  */
+		  if (note && GET_CODE (XEXP (note, 0)) != EXPR_LIST
+		      && CONSTANT_P (XEXP (note, 0)))
 		    comparison_value = XEXP (note, 0);
 		}
 	      break;